Protocol

The OSI Model and the Network Layer The Network Layer (Layer 3 of the OSI model) is responsible for logical addressing (e.g., IP addresses) and routing data packets between different networks. This is where your simple 4-byte addresses come into play. Goal: To wrap the Link Layer frame (Part 64) with a header that includes a Source Address and a Destination Address. Defining the Packet Structure Our simple network packet (often called a datagram) needs to sit inside the Link Layer frame and contain the necessary addressing information. ...

The OSI Model and the Link Layer Networking is organized into layers. The Link Layer (Layer 2 of the OSI model) is the lowest level of communication, responsible for sending and receiving frames (raw data packets) between two connected devices (e.g., two computers on a local network). Goal: To wrap user data with a small header and footer so the receiver knows where the packet begins, where it ends, and whether it’s valid. ...